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It seems that Danid has a great time in Xiamen.(改同义句) 回答:Dav

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It seems that Danid has a great time in Xiamen.(改同义句) 回答:David seems ___ ____ a great time
in XIamen
It seems that Danid has a great time in Xiamen.(改同义句) 回答:Dav
to have
再问: 请问to后面为什么是have
再答: have a good time 是固定用法
前一句里面David has a great time in Xiamen是整句话里的从句,也就是说这句话本身就是完整的句子,在这个完整的句子当中has是宾、谓语,而主语是David,要用单三,所以是has
后面一句里,to have 是to do不定式做seem的宾语,因而have并不是谓语动词,所以不需要有人称和数的变化。
你只要记住seem的两种用法:It seems that+从句; Sb. seems to do sth.